Air distributing device



March 9, 1954 c. DEMUTH AIR DISTRIBUTING DEVICE 3 Sheets-Sheet 1 Filed Feb. 28, 1952 IN V EN TOR.

T 5 u H M M U MMW A E W M March 9, 1954 c. DEMUTH AIR DISTRIBUTING DEVICE s SheetsSheet 2 Filed Feb. 28, 1952 INVENTOR. C HA RL E5 DE NUT/1.

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' Filed Feb. 28, 1952 9, 1954 c. PEMUTH 2,671,395

AIR DISTRIBUTING DEVICE 5 Sheets-Sheet I5 INVENTOR.

CHA E1. E5 DE MUTH.

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Patented Mar. 9, 1954 AIR DISTRIBUTING DEVICE Charles Demuth, Mineola, N. Y., assignor to Charles Demuth & Sons, Inc., Mineola, N. Y., a corporation of New York Application February 28, 1952, Serial No. 274,020

7 Claims.

1 This invention relates to air distributing devices and more particularly to distributors adapted to take 01f air from a running air duct common to a plurality of distributors.

ceiling.

1,800 feet per minute.

terference to the flow of air.

tribution of air.

the running duct.

air duct at desired points.

tional flow.

2 Further objects and advantages of the raven: tion will more fully appear from the following description taken in connection with the accompanying drawings which show, by wa 'of example, the present preferred embodiment of the The In distributors which are connected to individual ducts or ducts having individual branch out invention. lets for respective distributors it i practicable to The invention consists of the novel features equalize the flow of air to be distributed. Howand arrangement of parts embodied, by way "df ever, where running ducts are employed having example, in the structure hereinafter described substantial length, and especially where the as illustrating a present preferred form 'of the cross-sectional area is substantially uniform invention, and the invention will b "more particthroughout a given length where a plurality of ularly pointed out in th appended claiiiis. take-offs are desired, it is necessary to provide Referring more particularly to the drawings: means for adequately adjusting the amount of Fig. 1 is a perspective view, partly in section, air at respective take-off points. In the running showing a distributing unit secured to a running ducts of the character referred to the air velocity air duct; ranges from a minimum of about 900 feet per Fig. 2 is a cross-sectionalview taken substanminute to a maximum of about 1,800 feet per tially along the line 2-2 of Fig. 3, with certain minute, depending largely upon th height of the portions broken away;

For example, for a ceiling having a Fig. 3 is a longitudinal cross-sectional view height less than 15 feet it is accepted practice to taken substantially along the line 3'3 of Fig. 1; have an air velocity of about 1,000 to 1,200 feet Fig. 4 is a fragmentary sectiona1 view showin per minute and for ceilings having a height of further details of certain of the parts shown in 15 to 20 feet an air velocity of about 1,500 to Figs. land 3; I

With such air velocities Figs. 5 and 6 are cross-sectional views taken it has been found difficult to deflect the air downres'pectively at lines 5-5 and li-6 of Fig. 3; and wardly at the respective distributor outlets with Fig. 7 is a side elevational view, partly in seea substantially uniform distribution throughout tion, and Fig. 8 is a plan view illustrating a modithe cross-section of the distributor neck. It is fication of the device shown in Figs. 1-6, iiil-ikewise important to reduce to a minimum inelusive.

It has been pro- Referring more particularly to Fig. 1: the runposed to use flat dampers in the running duct at ning air duct is designated as l and the directhe respective distributor neck openings and by tion of air flow is indicated by arrows. adjusting these dampers to equalize the disdistributing device is designated in general as 2 However, such dampers tend and is provided with a neck portion in the forth to concentrate the air toward one side of the of a cylindrical take-oil pipe which, to facilitate distributor neck, which makes it difficult-if not production and assembly, preferably comprises impossible-to reduce substantially uniform air an upper section 3 and a lower section 4 suitably flow throughout the cross-sectional area of the secured together by screws, such as 5. The upper distributor neck; and, additionally, these plates 40 section is provided with a flange 6 adapted to be present substantial resistance to the air flow in secured as by screws 1 to the lower side ofthe duct l surrounding an outlet opening in the duct An object of this invention is to provide a dein register with the interior of the pipe 3. A hood vice adapted for attachment to running air ducts designated in general as B is provided with a so constructed as to facilitate attachment to the sleeve 8a slidably engaging the exterior of the lower pipe section 4, an outer horizontal skirt Another object of the invention is to provide portion 8b and an intermediate conical section a device of the character described which de- 80. Secured within the interior of the hood sleeve fle'cts air from the running duct into the distrib- 8d, adjacent the lower end thereof, are a pluutor neck in a substantially uniform cross-secrality of curved deflector vanes, such as arm-eh extend downwardly below the hood and carry Another object of the invention is to provide a fixed to their lower edges a conical deflector [0 device of the character described which offers a closed at its upper end. Secured in spaeearenminimum of interference to the flow of air tion beneath the cone I0 is a conical deflector ll through the running duct.

provided with an open upper end it. Th arrangement of the conical members l and I and the curved vanes 9 being in general quite similar to that shown in my Patent No. 2,367,104, except that in the present invention the vanes and conical members are fixed with respect to the hood member 8 in a manner now to be described below. The structure thus far described provides the distributor neck or take-off pipe having an outlet distributor end; and I will now describe the means for adjusting the volume of air taken off from the running duct.

Within the lower pipe section 4 is secured a diametrically extending journal strut I3 and within the pipe section 3, adjacent the lower end thereof, there is secured a corresponding journal strut M. An externally threaded hollow tubular member l5 is freely rotatably journaled in the journal strut l3 and is fixed against axial movement by means of a pair of nuts l5 (Fig. 3), which are in threaded engagement with the tube l5 and are secured respectively against the upper and lower faces of the journal strut 3. The lower end of the threaded tube i5 extends freely through an opening in the upper end of the cone I0 and a nut l! is in threaded engagement with the lower end of the tube l5 and serves as a means of supporting the hood 8 and the vanes 9 and cones l0 and H secured thereto. Within the bore of tube i5 there is freely rotatably disposed the lower end of a shaft I8 which is fixed against axial movement by a slotted head |9 carried on its lower end and by a retaining ring or boss 20 engaging the upper end of the tube l5. The upper end of the shaft I8 is non-circular (for example, square) and is telescopically disposed within a tubular shaft extension 2| with which it is rotatably drivingly connected by a corresponding square opening provided within the tubular shaft extension 2| (Fig. 6). The tubular shaft 2| is freely rotatably journaled adjacent its lower end in the journal strut l4 and is fixed against axial movement with respect thereto by means of a pair of nuts 22b secured to the shaft 2| above and below the strut !4 (Figs. 1 and 3) so as to permit rotation of the shaft 2| by means of the shaft |8 while holding the shaft 2| against axial movement. The tubular shaft 2| is exteriorly threaded and its upper end is in threaded engagement with a scoop member 22 so that upon rotation of the members It and 2| the scoop member 22 may be adjusted to the desired position between the limits indicated by the lower dotted lines and the upper solid lines. The upper limit of the scoop 22 is limited by a stop, such as a nut 2| a, which is secured to the upper end of the tubular shaft 2|. The scoop 22 is restrained from angular movement, as by means of an arm 24 rigidly secured thereto and extending downwardly within the upper pipe section 3 and slidably disposed within a clip 25 which is rigidly secured to the interior of the pipe section 3.

The scoop 22 is of concave form of generally conical shape (see also Fig. 1) having a closed top and downwardly and outwardly flaring walls. The scoop is set on the tubular shaft member 2| at a positive angle of incidence, such as 0, to the top of the pipe 3 and the axis AA of the cone is preferably asymmetrical to the axis of the adjusting shaft 2|.

The scoop arrangement has been found to produce substantially perfect uniform distribution throughout the cross-section of the distributor neck. However, at certain velocities and settings it has been found desirable to utilize an inwardly and downwardly inclined segmental bafile 26 secured interiorly of the pipe section 3, adjacent the lower end thereof, and disposed beneath the rear end of the scoop 22.

From the foregoing it will be apparent that the device is so designed that it may be made with facility and economy, both as to fabrication of its parts and as to assembly. Furthermore, it is adapted to be readily and quickly installed as a completely assembled unit entirely from the outside of the running duct I, simply by inserting the screws 5 through the flange 5 and in threaded engagement with the bottom wall of the running duct By means of the nuts 22 and Zia the upper limit of the scoop 22 may be readily set at the predetermined height before the device is fastened into place but while on the job and without any necessity for alterations. Likewise, by means of the nuts Hi and I! the output end deflector head may be readily removed and replaced to permit easy access to the interior of the pipe section 4, such as for adjustment of the nuts 22.

It will be understood that the scoop 22 is of such diameter as to permit its peripheral margin portion to freely slide interiorly of the pipe section 3.

MODIFICATION In certain installations where it is desired to reduce the distance which the device extends below the duct, as where the running duct is relatively low (e. g. is disposed beneath a beam) a modified form of the invention has been found useful.

In Figs. 7 and 8 I have shown such a modification, in which the running duct is designated as and the upper section of the take-off pipe as 3. In this case an annular flange 6' is formed a short distance (say about ar 2") from the lower end, to provide for securing the lower section 4 (Figs. 1 and 3) thereto, as shown in dotted lines; it being understood that in this modified embodiment the lower section and all parts carried thereby are identical with the embodiment shown and described with reference to Figs. 1-6, inclusive. The upper section 3' extends upwardly for its maximum height throughout only about of its diameter corresponding to the rear section 3'11 and is substantially reduced in height for the forward half of its diameter designated 3b, which is the effective intake end.

A threaded tubular sleeve 2| is freely rotatably journaled in a journal strut l4 and is restrained against axial movement therein and threadingly engages a scoop member 22', constructed and arranged in the manner previously described with respect to Figs. 1-6, inclusive, except for the specific differences now to be described.

In the modified structure the upper end of the shaft 2| passes freely through a support strap 21 supported on downwardly extending legs secured respectively to the rear and front walls of pipe sections 3'11 and 3'1) respectively. The scoop cone 22' is restrained against angular movement by means of a bifurcated plate 24 secured to the scoop 22 and straddling the front leg of the strap 21. A segmental baffle 26' is shown rigidly fixed interiorly of the cone scoop 22' instead of being supported on the interior of the pipe section, as in Figs. 1 and 3.

Except for the differences above described relative to the upper section, the modified device is the same as the embodiment described amines with "reference to Figs. 1-6, inclusive, and functions in a substantially identical manner.

Having thus described my invention with particularity with reference to a presently preferred form of the same, and a modification thereof, it will be obvious to those skilled in the art after understanding the invention, that various other changes and modifications maybe made therein without departing from the scope of the invention, and it is my intention to cover in the appended claims such changes as come within the scope of the invention.

What I claim is:

1. In an air distributing device, the combination of a take-oil pipe for use as an outletto an air duct, a concave scoop .for directing air into said pipe from said duct, said scoop having a lower peripheral marginal portion whose external diameter is smaller than the internal diameter of said pipe and said scoop being movable axially of said pipe to slide interiorly of the intake end of said pipe to substantially restrict the inlet opening thereof, said scoop extendin from said peripheral marginal portion upwardly and inwardly in gradually decreasing diameter to a closed central zone, means for holding said scoop with its peripheral margin disposed at a positive angle of incidence relative to the intake end of said pipe at all times and in register therewith, and means for adjusting said scoop toward and away from the intake end of said pipe to vary the inlet opening thereof while retaining a said positive angle of incidence of said scoop.

2. In an air distributing device, the combination of a take-oil" pipe for use as an outlet to an air duct, a concave scoop of generally conical form for directing air into said pipe from said duct, and a shaft angularly adjustable and axially disposed within said pipe and having an upper end on which said scoop is adjustably mounted, said scoop having a lower peripheral margin portion adapted to slide interiorly of the intake end of said pipe to substantially restrict the same, means for holding said scoop asymmetrically disposed relative to the axis of said pipe with its peripheral margin disposed at a positive angle of incidence to the intake end of said pipe.

3. In an air distributing device, the combination of a take-off pipe for attachment to a running air duct, an adjusting rod rotatably journaled within said take-off pipe and restrained against movement in an axial direction, the lower end of saidrod being provided with an engageable end extending to adjacent the lower end of said pipe and the upper end of said rod being provided with external screw threads and extending beyond the inlet end of said pipe, a concave scoop of generally conical shape supported in threaded engagement with the upper end of said adjusting rod for axial movement thereon when said rod is rotated, said scoop flaring downwardly and outwardly with its lower perimeter disposed at a positive angle of incidence to the top of said pipe and being of a diameter permitting the downwardly extending portion thereof to be retracted within said pipe, and means for restraining said scoop against angular movement.

4. In an air distributing device, the combination of a take-oil pipe for attachment to a running air duct, a deflector cone providing a downwardly and outwardly flaring wall fixed, in axially spaced relation to and concentric with the outlet end of said pipe, an adjusting rod rotatably journaled within said take-off pipe and re-- strained against movement in an axial direction, the lower end of said rod being provided with an engageable end extending through said deflector cone and the upper end of said rod bein provided with external screw threads and extending beyond the inlet end of said pipe, a concave scoop of generally conical shape supported in threaded engagement with the upper end of said adjusting rod for axial movement thereon when said rod is rotated, said scoop flaring downwardly and outwardly with its lower perimeter disposed at a positive angle of incidence to the top of said pipe and being of a diameter permitting the downwardly extending portion thereof to be retracted within said pipe, and means for restraining said scoop against angular movement.

5. In an air distributing device, the combination of a take-ofl pipe for attachment to a running air duct, said pipe comprising an upper section and a lower section, an adjusting rod comprising an upper section and a lower section, a first journal strut disposed within and secured to said upper pipe section, said upper rod section being rotatably journaled in said first journal strut and having its upper end extending outwardly beyond the upper end of said upper pipe section, a second journal strut disposed within and secured to said lower pipe section, said lower rod section being rotatably journaled in said second strut in telescopic relationship and rotatable driving engagement with said upper rod section, the lower end of said lower rod section being provided with an engageable portion disposed adjacent the lower end of said lower pipe section, a concave scoop of generally conical shape supported on the outwardly extending end of upper rod section for axial movement thereby when said rod is rotated, said scoop flaring downwardly and outwardly with its lower perimeter disposed at a positive angle of incidence to the top of said pipe and being of a diameter permitting the downwardly extending portion thereof to be retracted within said pipe, and means for restraining said scoop against angular movement.

6. In an air distributing device, the combination of a take-ofi" pipe for attachment to a running air duct, said pipe comprising an upper section and a lower section, a deflector cone providing a downwardly and outwardly flaring wall fixed in axially spaced relation to and concentric with the outlet end of the lower section of said pipe, an adjusting rod comprising an upper section and a lower section disposed axially of said pipe, said sections being telescopically arranged to provide for varying rod lengths and being in rotatable driving engagement one with the other, said upper rod section being rotatably journaled within the upper section of said take-oil pipe and restrained against movement in an axial direction, the upper end of said upper rod section being provided with external screw threads and extending beyond the inlet end of said pipe, said lower rod section being rotatably journaled within the lower section of said pipe and provided with an engageable end extending through said deflector cone, a concave scoop of generally conical shape supported in threaded engagement with the upper end of said adjusting rod for axial movement thereon when said rod is rotated, said scoop flaring downwardly and outwardly with its lower perimeter disposed at a positive angle of incidence to the top of said pipe and being of a diameter permitting the downwardly extending portion thereof to be retracted within said pipe, and means for restraining said scoop against angular movement.

7. In an air distributing device, the combination of a take-ofi pipe for attachment to a running air duct, said pipe comprising an upper section and a lower section, an adjusting rod comprising an upper section and a lower section, a first journal strut disposed within and secured to said upper pipe section, said upper rod section being rotatably journaled in said first journal strut and having its upper end extending outwardly beyond the upper end of said upper pipe section, a second journal strut disposed within and secured to said lower pipe section, said lower rod section being rotatably journaled in said second strut in telescopic relationship and rotatable driving engagement with said upper rod section, the lower end of said lower rod section being provided with an engageable portion disposed adjacent the lower end of said lower pipe section, a concave scoop of generally conical shape supported on the outwardly extending end of upper rod section for axial movement thereby when said rod is rotated, said scoop flaring downwardly and outwardly with its lower perimeter disposed at a positive angle of incidence to the top of said pipe and being of a diameter permitting the downwardly extending portion thereof to be retracted within said pipe, means for restraining said scoop against angular movement, and an inwardly and downwardly inclined segmental baflie secured interiorly of said pipe adjacent the lower end of its upper section and disposed beneath the rear edge of said scoop.

CHARLES DEMUTH.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 2,216,075 Henderson Sept. 24, 1940 2,271,010 Honerkamp Jan. 27, 1942 2,273,818 Childers et a1. Feb. 24, 1942 2,311,195 Young Feb. 16, 1943 2,367,104 Demuth Jan. 9, 1945 FOREIGN PATENTS Number Country Date 379,604 Italy Mar. 30, 1940 819,923 France July 19, 1937 506,443 Great Britain May 30, 1939 665,866 Great Britain Jan. 30, 1952 

